/*
 * Copyright (c) 2004-2013, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * Neither the name of the HISP project nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

var dhis2 = dhis2 || {};
dhis2['appcache'] = dhis2['appcache'] || {};

function applicationCacheSupported() {
  return typeof window.applicationCache !== 'undefined';
}

$(function() {
  if( !applicationCacheSupported() ) {
    return;
  }

  $(window.applicationCache).on('updateready', function( e ) {
    if( window.applicationCache.status == window.applicationCache.UPDATEREADY ) {
      // Browser downloaded a new app cache.
      if( confirm('An update is available. Refresh to update?') ) {
        window.location.reload();
      }
    }
  });

  if( window.applicationCache.status > 0 ) {
    $(document).on('dhis2.online', function() {
      dhis2.appcache.updateAppCache();
    });
  }
});

dhis2.appcache.updateAppCache = function() {
  // check and download updated appcache, will fire of updateready
  window.applicationCache.update();
};
